spring-reactive

name	spring-reactive
description	Build, configure, deploy, monitor, and optimize reactive APIs and services with Spring WebFlux, Project Reactor (Mono, Flux), WebClient, and reactive operators. Capabilities include MDC context propagation (ContextRegistry, Hooks.enableAutomaticContextPropagation), WebClient configuration (timeouts, error handling, retry), reactive operator chains (flatMap, switchIfEmpty, zip), and blocking detection with BlockHound. Configure Schedulers, WebTestClient, deferContextual, and contextWrite for production. Use when implementing WebFlux endpoints, propagating MDC/trace context across reactive boundaries, configuring WebClient, debugging context loss, handling backpressure, or testing reactive streams with StepVerifier.
license	MIT
metadata	{"version":"1.0.0","audience":"developers","workflow":"backend-development"}

Spring Reactive

Build non-blocking, reactive web applications with Spring WebFlux and Project Reactor. This skill focuses on production patterns, especially MDC context propagation which is the #1 pain point in reactive applications.

When to Use Me

• Implement reactive REST endpoints with WebFlux
• Propagate MDC context (traceId, requestId) across async boundaries
• Configure WebClient with proper timeouts, retries, and error handling
• Debug "context loss" issues where traceId disappears in logs
• Chain reactive operators (Mono/Flux) correctly
• Detect and handle blocking calls in reactive code
• Test reactive streams with StepVerifier

What I Do